Issue with Query and its Bookmark

Hi All,

I have query which after execution shows Kf1 along with Ch1. Basically it has Kf 1,2,3 (2,3 are in hide can be shown).

It was working fine, suddenly today I'm able to see a error message displaying as "Could not find any data to display. This might be due to the current selection of variable or filter values " by seeing this message intially i thought there was no data but after further investigation i found that data was there for Kf1.

Then I cleared all Columns (i mean to say displayed all KF1,2,3) then i was able to see data for Kf1 which is fine and then i bookmarked it and tried to execute the bookmark but unfortunately it was again showing the same error message.

Now I have 2 questions:

1. Even though there is data for Kf1 which is by default in Display why the error message is shown?

2. Why the bookmark is not working which is saved with correct values?